cant save fone numbers?

hallo...
i cnt save fone numbers on my 8310 (phone memory- sim works). as a result i hav 2 keep ol txts from ppl so i cn fone em...

ne1 know wot is wrong with it?

someone must know wots wrong?

u must flash ur phone with letest ver..
and could work...

thanks and regards

Is it true that when we upgrade the 8310 to the v5.57, the signals will be better?
TIA